• Title, Summary, Keyword: DBCP

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Comparison Solid Phase Microextraction with Purge & Trap on the GC/MS Analysis of Volatile Organic Compounds in Biota Samples (Solid Phase Microextraction 및 Purge & Trap을 이용한 생물시료 중 휘발성 유기화합물의 GC/MS 분석비교)

  • Ahn, Yun-Gyong;Seo, Jong-Bok;Hong, Jongki
    • Analytical Science and Technology
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    • v.14 no.5
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    • pp.392-399
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    • 2001
  • The analysis of n-butylbenzene and 1,2-dibromo-3-chloropropane (DBCP) as volatile organic compounds in biota samples was performed by gas chromatography/mass spectrometry-selected ion monitoring mode. The target compounds, n-butylbenzene and DBCP, in biota samples were extracted by headspace solid phase microextraction (SPME) with $100{\mu}m$ polydimethyl siloxane (PDMS) fiber and purge & trap method. The extraction recoveries of these compounds obtained by SPME was 85.8% for n-butylbenzene and 92.4% for DBCP, respectively. Each value of method detection limit were $0.15{\mu}g/kg$ and $0.05{\mu}g/kg$, respectively. While in the case of purge & trap method, the extraction recovery was 115.2% for n-butylbenzene, 80.9% for DBCP and method detection limit were $0.04{\mu}g/kg$ and $0.70{\mu}g/kg$, respectively. The extraction yields and detection limits of these compounds obtained by purge & trap were equivalent to those by SPME.

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Determination of DBCP and n-Butylbenzene using SPME with GC-MS (SPME-GC-MS를 이용한 DBCP 및 n-Butylbenzene의 분석)

  • Park, Hyun-Mee;Kim, Young-Man;Lee, Dai-Woon;Lee, Kang-Bong
    • Analytical Science and Technology
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    • v.14 no.6
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    • pp.471-475
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    • 2001
  • Solid phase microextraction(SPME) with $85{\mu}m$-polyacrylate (PA) and $100{\mu}m$-polydimethylsiloxane(PDMS) fibers, coupled to gas chromatography-mass spectrometry was used to determine 1,2-dibromo-3-chloropropane(DBCP) and n-butylbenzene in water. The conditions affecting the SPME process(i.e, extraction time, injection length, injection temperature, desorption time and temperature) were optimized. The linearity of the calibration curve (correlation coefficient, R) was over 0.99 and the limits of detection of the method were between 1.5 and $10.8{\mu}g/L$. Repeatability of the method was between 10.4 and 14.4 %.

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On the Effects of Emulsifiable DBCP for Control of the Citrus-root Nematode, Tylenchulus semipenetrans in Two Citrus Orchards (감귤선충 (Tylenchulus semipenetrans) 에 대한 DBCP 유제처리효과)

  • Lee Young-Bae;Han Sang-chan;Park Joong-Soo
    • Korean journal of applied entomology
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    • v.14 no.3
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    • pp.141-146
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    • 1975
  • Experiments were carried out to know the effects of emulsifiable DBCP, (Dibromo Chloropropane) for control of the citrus-root nematode, Tylenchulus semipenetrans in Orchards of chinese citron and mandarine orange for four years of 1967-1970. Nematode population density decreased as the amount of DBCP increased. In mandarine orange orchard, the nematode population density decreased after second treatment mainly because of bad drainage of the soil, while in Chinese citron orchard, it fell off sharply after just one treatment since the soil was well drained. Yields of Chinese citron increased as much as $26\%$ in 4.4l/10a injection, 1$18\%$ in 4.4l/10a drench; yields of mandarine orange increased as much as $11\%$ in 4.41/10a injection and $13\%$ in 4.4l/10a drench.

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Mutation Spectrum of 1, 2-Dibromo-3-chloropropane, an Endocrine Disruptor, in the lacI Transgenic Big $\textrm{Blue}^{(R)}$ Rat2 Fibroblast Cell Line.

  • Kim, Youn-Jung;Chai, Young-Gyu;Lee, Kilchul;Kyounghee Oh;Ryu, Jae-Chun
    • Proceedings of the Korea Society of Environmental Toocicology Conference
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    • pp.129-129
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    • 2001
  • 1,2-Dibromo-3-chloropropane (DBCP), a soil fumigant against nematodes, is a genotoxic carcinogen and also is classified by World Wildlife Fund as endocrine disruptors. DBCP has been extensively studied on genotoxicity, carcinogenicity, and damage in male reproductive-related organs. However, information on precise mechanism of mutagenesis and carcinogenesis of DBCP is yet unknown. (omitted)

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MUTATION SPECTRUM OF 1,2-DIBROMO-3-CHLOROPROPANE, AN ENDOCRINE DISRUPTOR, IN THE lacI TRANSGENIC BIG BLUE$\circledR$ RAT2 FIBROBLAST CELL LINE

  • Kim, Youn-Jung;Chai, Young-Gyu;Ryu, Jae-Chun
    • Proceedings of the Korean Society of Toxicology Conference
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    • pp.181-181
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    • 2001
  • 1,2-Dibromo-3-chloropropane (DBCP), a soil fumigant against nematodes, is a genotoxic carcinogen and also is classified by World Wildlife Fund as endocrine disruptors. DBCP has been extensively studied on genotoxicity, carcinogenicity, and damage in male reproductive-related organs. However, information on precise mechanism of mutagenesis and carcinogenesis of DBCP is yet unknown. Thus the mutation spectrum and mechanism of DBCP was determined in lacI transgenic Big Blu $e^{R}$ Rat2 fibroblast cell lines.(omitted)d)

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A Web Based Archery Game Support System (웹기반 궁도경기지원시스템 개발)

  • Kwak, Chang-Uk;Byun, Jeongyong
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1754-1757
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    • 2012
  • 전국의 궁도인구는 만 여명에 이른다. 매년 1~2주를 주기로 개최되는 이 대회는 참가접수부터 운영까지 오로지 오프라인으로만 진행되어 경기외적인 비용과 시간이 상당히 낭비된다. 이에 본 연구에서는 이용자의 접근성이 향상되고, 플랫폼에 독립적인 웹기반의 경기지원시스템을 구현하고자 한다. 시스템에 접근하는 이용자는 접수와 결과를 확인하는 대회 전/후에 집중되므로 이 때의 효율적인 DB Access 기술이 필요하다. 따라서 본 논문에서는 DBCP 기술을 이용하여 DB Connection부분에서 보다 효율적인 시스템으로 개발하고자 한다.

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Database connection pool architecture for interconnections simplicity access (동시사용자 접근이 용이한 데이터베이스 커넥션 풀 아키텍처)

  • Kim, Young-Chan;Lee, Se-Hoon
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.125-130
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    • 2008
  • 어플리케이션의 데이터베이스 시스템 사용이 증가하면서, 사용자 급증에 따른 데이터베이스 시스템에 동시접속 하는 커넥션 처리 방법에 있어 중요성이 부각되고 있다. 이러한 데이터베이스의 커넥션을 효과적으로 처리하기 위해 데이터베이스 커넥션 풀이 도입되었으나, 동시접속이 증가하는 형태에 따른 커넥션 처리는 미비한 실정이다. 이 논문에서는 기존의 커넥션 아키텍처를 개선하여 주 커넥션 풀과 보조 커넥션 풀, 두 커넥션 풀의 연결을 할당하기 위한 커넥션 브로커 관계에 있어 새로운 아키텍처를 정의하였고, 실험을 통하여 기존 데이터베이스 커넥션 풀 구조와 비교해서 100% 가량 성능이 향상된 결과를 제시하였다.

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